From the metagame analysis above, it's clear that green is popular, followed by blue and red
It pumps out massive amounts of damage through the combination of 33 different creature spells or squirrel-token spells, combined with 14 different anthem effects (including chitterspitter, which given enough time can make your team enormously strong on its own)
Every card that you put into your hand was another card worth having, even if you had no use for it
Stormbreath Dragon also featured at that very same World Championship, where it was used as a powerful finisher and a way to push through damage
That obviously flows with the theme of the deck
On a meta-level, a variety of Magic sets include special cards from previous sets and blocks, often with new art and even new card frames to provide collector's items to show off